JP3386823B2 - File management method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information management system in general in which the total amount of data and a periodic increase amount cannot be known in advance, and more particularly to an online database system in which a large number of data additions and inquiries compete.

[0002]

2. Description of the Related Art When a file runs out of space due to repeated data addition, a file management system reports a file space shortage error to a business processing program, and the business processing program interrupts its business. For this reason, the file manager has to separate the file from the online work, increase the space, reallocate the data, and then store the data again, or allocate the additional space. Since it is necessary to interrupt online business in such file expansion means, it is necessary to constantly monitor the usage status of the file and predict the increase in data volume, and manually expand the file at an appropriate time such as at night. The complexity was a problem. Also,
The service time of online business tends to be extended to nighttime and holidays, and appropriate opportunities for file expansion are being lost.

Therefore, there is a method in which a file management system automatically expands a certain amount of files when a file is in a shortage of free space or before it is in a shortage of free space. For example, Japanese Patent Laid-Open No. 2-61732
As shown in, the usage threshold for automatically expanding files and the media name for automatic expansion are registered in advance, and when the usage threshold is exceeded, additional files are automatically allocated. There is a way to do it. In other words, it automatically manages the usage status of files and dynamically inquires about the means for expanding files when the usage threshold specified during file allocation is exceeded, or the need for file expansion. The means and the means for dynamically expanding the file allow the file to be expanded without stopping the online business.

[0004]

The conventional method has the following problems.

That is, since the input / output operation of the file is performed based on the space management information held in the memory corresponding to the file, all the input / output operations to the file are performed during the expansion process in which the space management information is changed. You need to wait. For this reason, during the expansion processing of a file, a business that uses the file temporarily waits, and the online response deteriorates.

Further, in the method in which another file is additionally allocated and a plurality of files are made to appear as one logical file as a whole, another file can be additionally allocated while continuing the input / output processing to the existing file. With each expansion, the number of physical files increases, which leads to an increase in the amount of memory that manages them and the number of open processes for the entire file, which complicates operation. In addition, record storage commands and files from business processing programs When the file extension process is performed by extension of the extension command, the overhead of the file extension process is added during the task process, and the response of the task deteriorates.

On the other hand, if the trigger of file expansion is judged by the threshold value of the usage rate, there are the following problems.

Since the entire file capacity is increased by expanding the file, if the expansion allocated space amount is smaller than the remaining free space amount at the time when the usage threshold is reached, the trigger to start the expansion increases. Each time is performed, the originally unnecessary expansion is performed and the space of the medium is unnecessarily occupied. On the other hand, if the expansion allocation space amount is larger than the remaining free space amount when the usage threshold is reached, there is a high possibility that the remaining free space will be used up before the expansion is completed, and the expansion will be completed. The work will be in a waiting state until you do it.

Further, when one file is shared by a plurality of file management systems, there are the following problems.

That is, the space management information of a file expanded under one file management system does not match the space management information held by another file management system, and the record in the expanded space becomes inaccessible or already expanded. It will unreasonably re-extend existing files.

Further, when some trouble occurs in the automatically expanded file or the file expansion process itself, there are the following problems.

That is, generally, the file management system inputs the record update, addition, and deletion history information for the file after that into the latest file backup copy and reproduces the update, addition, and deletion processing of the file in time series. Then, a means for recovering the file is provided, and it is necessary to be able to recover the automatically expanded file by the same means. Further, if any failure occurs during the expansion processing of the file, if the entire file is disabled, the work in the existing space before the expansion is also completely stopped.

An object of the present invention is to provide a method capable of automatically expanding a file without interrupting business processing.

Another object of the present invention is to provide a method capable of automatically expanding a file without affecting the business processing while continuing the business processing.

Still another object of the present invention is to provide a method capable of automatically expanding a file while keeping the space efficiency of the medium optimum.

[0016]

[0017]

[0018]

[0019]

[Means for Solving the Problems] One for achieving the above object
As a means of, at least new space management information is generated.
The storage location of the record is already stored in memory until it is created
Records that are within the range of space management information
Based on the space management information stored in memory.

[0020]

[0021]

[0022]

[0023]

According to the above means, new space management information
Until it is created, the space management information that has already been created is created.
Information (current space management information) is left in memory
It Therefore, within the current space management information
Current space when record storage processing occurs
Storing records according to management information will expand the file.
It is possible to execute business processing in the existing space before Zhang
Wear. In other words, the process of expanding the file is being performed
Also allows business processing in the existing space before file expansion.
It becomes possible to execute.

[0024]

[0025]

[0026]

[0027]

[0028]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In the embodiment of the present invention, the file extension information registration means 1 for registering the file extension information 51 such as the amount of space to be extended-allocated and the remaining free space amount to start the extension to the register 21, and the record operation from the business processing program 31. According to the request, the record operation unit 2 stores the record in the file 22 and updates, deletes, and refers to the record stored in the file 22, and the space management information 71 of the file 22 and the file extension information of the register 21 The file 22 is expanded by a process (process 62) different from the file expansion trigger detection unit 3 that detects the expansion trigger of No. 22 and the process 61 that has caused the file expansion by the communication from the file expansion trigger detection unit 3. The file asynchronous extension means 4 and the extension history of the file 22 are stored in the history file 23. File extension history acquisition means 5
And a file extension completion waiting means 6 for making the record storage process wait until the extension is completed when the free space is used up before the extension of the file 22 is completed.
File extension information for transmitting the space management information 43 of a file extended under another file management system to the space management information 42 of its own file management system in a configuration in which one file is shared by a plurality of file management systems The notification means 7, the dynamic file information matching means 8 forcibly matching the space management information 42 of the file management system with the space management information 71 of the actual file, and when a failure occurs during the expansion processing of the file 22 A file extension prohibition unit 9 for suppressing the re-extension of the file 22, a file extension interruption detection unit 10 for checking the extension state of the file 22 from the history file 23 to detect the interruption state of the extension process, and a backup file when the file 22 fails. Extended file to recover file 22 from 24 and history file 23 And a le recovery unit 11.

Next, the operation of each means of the embodiment shown in FIG. 1 will be described with reference to FIG.
From now on, description will be made with reference to the flowchart shown in FIG.

FIG. 2 is a flow chart showing the processing procedure of the file extension information registration means of the embodiment of the present invention. The operation of the file extension information registration means 1 will be described with reference to FIG.
When the file extension information 51 is registered (102), the file extension information (104) such as the file name, initial allocation amount, expansion allocation amount, allocation medium name and expansion start remaining free space amount is input (106). The input file definition information is edited and output to the register 21 (108). When reading the file extension information (110), the information of the corresponding file is input from the register 21 to the memory (112). When changing the file extension information (114), the change information (116) is input (118). Next, the file information is input from the register 21, the contents are rewritten with the change information, and then output to the register 21 (12
0). At this time, the file extension information already entered in the memory is also rewritten (122).

FIG. 3 is a flow chart showing the processing procedure of the record operating means of the embodiment of the present invention. The operation of the record operating means 2 will be described with reference to FIG. When a record operation command is issued from the business processing program 31, the record operation means 2 receives and analyzes the record operation command (20
After performing 2), the record storage position in the file is determined (204). The space management information 42 is used to check whether the record storage position is within the current file space range (206). If the storage position of the record exceeds the current space range, it is checked whether the file 22 is expanded. In this checking method, first, the file registered in the register 21 is checked for a file to be automatically expanded (208). If the file is not auto-extending, error (210) of insufficient free space occurs. When the file is to be automatically expanded, the file expansion completion waiting means 6 waits for the completion of the file expansion (212). In the case of a file shared by a plurality of file management systems (214), the information of the file expanded by another file management system by the dynamic file information matching means 8 is reflected in the own system (216). When the file space becomes large and the record storage position can be within the file space range (218), the record operation processing is continued. Next, in the case of a file that is automatically expanded and is not in the expansion prohibited state (220), the file expansion trigger detection means 3 checks whether the file 22 is an expansion trigger (222). Next, the input / output buffer 4
Operate the record using 1 (224). At this time, if input / output to / from the file 22 is required (226), input / output operation is performed using the current space management information 42 (228).

FIG. 4 is a flow chart showing the processing procedure of the file expansion completion waiting means of the embodiment of the present invention. The operation of the file expansion completion waiting means 6 will be described with reference to FIG.
First, the extension processing state of the file 22 is checked in the memory (602). If the file 22 is undergoing expansion processing (60
4) After waiting for a certain period of time (606), check again (60
2). By repeating this, the expansion of the file 22 is waited for.

FIG. 5 is a flow chart showing the processing procedure of the dynamic file information matching means of the embodiment of the present invention. Figure 5
The operation of the dynamic file information matching means 8 will be described using. First, the space management information 71 of the file 22 is input from the medium (802). Next, the input space management information is newly set as the space management information 42 in the memory (804).

FIG. 6 is a flow chart showing the processing procedure of the first example of the file extension trigger detecting means of the embodiment of the present invention. A first example of the operation of the file extension trigger detection means 3 will be described with reference to FIG. First, the free space amount of the file 22 is checked by the space management information 42 (302), and if it is less than or equal to the remaining free space amount to be the trigger for expansion (304), it is further checked whether or not the file 22 is being expanded (3
06). If the extension processing is not in progress, the extension processing information of the file 22 is set in the memory (308) and an extension request is made to the file asynchronous extension means 4 (310).

FIG. 7 is a flowchart showing the processing procedure of the second example of the file expansion trigger detecting means of the embodiment of the present invention. A second example of the operation of the file extension trigger detecting means 3 will be described with reference to FIG. First, the free space amount of the file 22 is checked by the space management information 42 (322), and if it is less than or equal to the extended allocation amount (324), it is further checked whether or not the file 22 is being extended (326). If the extension processing is not in progress, the extension processing information of the file 22 is set in the memory (328) and an extension request is made to the file asynchronous extension means 4 (330).

FIG. 8 is a flow chart showing the processing procedure of the third example of the file extension trigger detecting means of the embodiment of the present invention. A third example of the operation of the file extension trigger detecting means 3 will be described with reference to FIG. First, the time required for expansion is calculated from the expanded allocation space amount (342). Then file 22
Determine the amount of used space in (344). Next, the current used space amount is saved in the old used space amount save area (346). Next, the maximum value of the space increase amount is initialized to 0 (348). Next, the current used space amount of the file 22 is calculated (350). Next, when the current used space amount is a and the old used space amount is b, a-
Set b to the space increment (352). When the space increase becomes larger than the maximum space increase (35
4) Set the space increment to the maximum space increment (356). Next, the old used space amount is set to the current used space amount (358). Wait the specified monitoring time until the file management system is closed (360) (36
2) Repeat from the process (350) for obtaining the used space of the file. In this way, the maximum value of the space increase amount in the designated monitoring time interval is always held.

On the other hand, on the detection side (370) of the file expansion trigger, first, the free space amount of the file 22 is calculated (37
2). Next, when the designated monitoring time is t, the remaining free space amount is c, and the maximum space increase amount is d, t × (c /
(d) is set to the estimated completion time of the remaining free space (374). When the estimated completion time of the remaining free space is less than or equal to the expansion time of the expansion allocation space amount (376),
Check if file 22 is in the process of extension
(378). If the extension processing is not in progress, the extension processing information of the file 22 is set in the memory (380) and an extension request is made to the file asynchronous extension means 4 (382).

FIG. 9 is a flow chart showing the processing procedure of the file asynchronous extension means of the embodiment of the present invention. The operation of the file asynchronous extension means 4 will be described with reference to FIG. When a file extension request is received (402), first, file 2
It is checked whether or not 2 is in the extension prohibition state (404). If the expansion is prohibited, the process ends without doing anything. If it is not in the expansion prohibited state, it is checked whether there is old space management information (406). If you have old space management information,
The old space management information is checked to see if there is a record operation in use (408), and if there is no record operation in use, the old space management information is released (410). Next, the file extension start history is acquired by the file extension history acquisition means 5 (4
12). Next, the file 22 is expanded according to the expansion quota specified by the file expansion information 51 (414). If the extension of the file 22 fails (416), the file extension prohibiting means 9 puts the file 22 in the extension prohibited state (41).
8). If the file is successfully expanded (416), the new space management information 43 is created in the memory (420), and then the expansion space is initialized (format write) using the dedicated input / output buffer 44 (422). ). If the initialization of the expansion space has failed (424), the file 22 is set in the expansion prohibition state by the file expansion prohibition means 9 (418). Next, the file expansion history acquisition means 5 acquires the history of file expansion completion (426). Next, the file extension information notifying means 7 updates the space management information 42 (42
8).

FIG. 10 is a flow chart showing the processing procedure of the file extension information notifying means of the embodiment of the present invention. Figure 1
The operation of the file extension information notifying means 7 will be described using 0. First, the current space management information 42 is set as the old space management information (702). Next, the new space management information 43 is set as the current space management information 42 (704). Next, the in-expansion processing information in the memory is reset (706).

FIG. 11 is a flow chart showing the processing procedure of the file extension history acquisition means of the embodiment of the present invention. Figure 1
The operation of the file extension history acquisition means 5 will be described using 1. First, it is checked whether it is a request at the start of file expansion or a request at the completion of file expansion (502). If it is a request at the start of file expansion, the total space amount of the file, the expansion start position information, and the expansion amount are Output to history file 23
(504). If it is a request at the time of completion of file expansion, the total space amount of the file and the expansion completed space amount are output to the history file 23 (506).

FIG. 12 is a flow chart showing the processing procedure of the file expansion inhibiting means of the embodiment of the present invention. The operation of the file extension prohibiting means 9 will be described with reference to FIG. When prohibiting expansion of a file, first, expansion prohibition information is set in the memory (902). Next, the extension prohibition information is output to the history file 23 (904). The file extension prohibition state is released at the same time when the file allocation is released. When deallocating a file (920), if file extension is in a prohibited state (922), first reset the extended prohibition information in the memory (924), and then release the extended prohibition release information. Output to file 23 (926). After that, the allocation of the file is released (928).

FIG. 13 is a flow chart showing the processing procedure of the file extension interruption detecting means of the embodiment of the present invention. Figure 1
The operation of the file extension interruption detecting means 10 will be described with reference to FIG. When the file is opened in the restart process after the file management system abnormally ends, first, the file 22 is opened (1002). If the open process fails (1
004), access to the file 22 is prohibited (1006), and the extended file recovery means 11 recovers it (1008). If the open process is successful (1004), the file extension and completion history are input from the history file 23 (1010), and if the extension start history and the extension completion history are not paired (1012), the extension processing is interrupted. Then, the file extension prohibiting means 9 puts the file 22 in the extension prohibited state (1014).

FIG. 14 is a flow chart showing the processing procedure of the extended file recovery means of the embodiment of the present invention. The operation of the extended file recovery means 11 will be described with reference to FIG. First, reload the backup file to the new volume (1102). Next, the history information after the backup is acquired is sequentially input to the end of the history file 23 (1106) (110
Four). If the entered history information is file extension start information (1
108) Set the extended display (1109). If the input history information is the file extension completion information (1110), and if the extension display is set (1111), after the file extension and the extension area are initialized for the file 22 by the extension completion space amount ( 1112) and the extended display is reset (1113). On the other hand, if the extended display is not set (1111), a history information error occurs (1114). If the input history information is the post-update information of the record, (1115) output the post-update information to the file 22.
(1116).

[0045]

As described above, the file is expanded.
File is being processed, the existing space before the file expansion
It becomes possible to execute business processing within the source.

Furthermore, even a file shared by a plurality of file systems can be automatically expanded without contradiction between the systems.

Further, even if a failure occurs in the automatically expanded file or the expansion process itself, the file can be recovered or the operation can be reduced.

Further, it is not necessary to accurately calculate the total amount of file space required for storing a large amount of data in a file, refilling a file, and migrating a file.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of each means of an embodiment of the present invention,

FIG. 2 is a flowchart showing a processing procedure of a file extension information registration means of the embodiment of the present invention,

FIG. 3 is a flowchart showing the processing procedure of the record operating means of the embodiment of the present invention,

FIG. 4 is a flowchart showing a processing procedure of a file extension completion waiting means of the embodiment of the present invention;

FIG. 5 is a flowchart showing a processing procedure of a dynamic file information matching means of an embodiment of the present invention,

FIG. 6 is a flowchart showing a processing procedure of a first example of the file expansion trigger detection means of the embodiment of the present invention;

FIG. 7 is a flowchart showing a processing procedure of a second example of the file extension trigger detection means of the embodiment of the present invention;

FIG. 8 is a flowchart showing a processing procedure of a third example of the file extension trigger detection means of the embodiment of the present invention;

FIG. 9 is a flowchart showing the processing procedure of the file asynchronous extension means of the embodiment of the present invention;

FIG. 10 is a flowchart showing a processing procedure of a file extension information notifying unit according to the embodiment of the present invention;

FIG. 11 is a flowchart showing a processing procedure of a file extension history acquisition unit according to the embodiment of the present invention;

FIG. 12 is a flow chart showing the processing procedure of the file extension prohibition means of the embodiment of the present invention;

FIG. 13 is a flowchart showing a processing procedure of the file extension interruption detecting means of the embodiment of the present invention;

FIG. 14 is a flowchart showing the processing procedure of the extended file recovery means according to the embodiment of the present invention.

[Explanation of symbols]

1. File extension information registration means, 2 ... Record operation means, 3 ... File expansion trigger detection means, 4 ... File asynchronous extension means, 5: File extension history acquisition means, 6 ... File expansion completion waiting means, 7 ... File extension information notifying means, 8 ... Dynamic file information matching means, 9: File expansion prohibition means, 10 ... File extension interruption detecting means, 11 ... Extended file recovery means, 21 ... Register, 22 ... file, 23 ... history file, 24 ... backup file, 31 ... Business processing program, 41 ... Input / output buffer, 42 ... Space management information, 43 ... Space management information, 44 ... I / O buffer, 51 ... file extension information, 61 ... Process, 62 ... Process, 71 ... Space management information

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takatoshi Iwamoto 6-81 Onoe-cho, Naka-ku, Yokohama-shi, Kanagawa Hitachi Software Engineering Co., Ltd. (72) Inventor Kota Yamaguchi 6-chome, Onou-cho, Naka-ku, Yokohama-shi, Kanagawa 81 In Hitachi Software Engineering Co., Ltd. (72) Inventor Yasushi Muragata 6-81 Onoue-cho, Naka-ku, Yokohama-shi, Kanagawa Hitachi Software Engineering Co., Ltd. (56) Reference JP-A-2-310726 (JP, A) JP-A-2-61732 (JP, A) JP-A-3-53350 (JP, A) JP-A-2-216556 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) G06F 12/00

Claims (6)

(57) [Claims] 1. A step of storing space management information indicating a storable range of the stored file, and storing a record in the file based on the space management information , and a file based on a predetermined allocation space amount. If it is necessary to expand the file, it is determined whether the file is being expanded. If the file is being expanded, wait until the expansion of the file is completed, and the expansion of the file is completed.
After that, space management information indicating the storable range of the expanded file is generated, and if the file is not undergoing expansion processing, the file is expanded based on the predetermined allocated space amount and the file is stored. Generating and storing space management information indicating a possible range; and storing the record whose storage position is within the range of the stored space management information at least until the space management information after the file extension is generated. And a step of storing the file based on management information. 2. A record storing step of storing first space management information indicating a storable range of a file, and storing a record in the file based on the space management information, and based on a predetermined allocated space amount. When it is necessary to expand the file, it is determined whether the file is being expanded. If the file is being expanded, wait until the expansion of the file is completed, and the expansion of the file is completed.
After that, the second space management information indicating the storable range of the file is generated, and if the file is not being expanded, the file is expanded based on the predetermined allocated space amount and the A file extension step of generating second space management information indicating a storable range, a file extension information notification step of using the second space management information as the first space management information, and during execution of the file extension step. A record operation step of storing a record whose storage position is within the range of the first space management information into a file based on the first space management information. 3. The file expanding step, when the free space amount obtained from the first space management information is equal to or smaller than a predetermined space amount, stores the file based on a predetermined allocated space amount. The file management method according to claim 2, wherein second space management information indicating a possible range is generated. 4. The file extension information notifying step uses the first space management information as third space management information, the second space management information as the first space management information, and the file expansion step. When the third space management information is not used, the third space management information is released, and the second space management indicating the storable range of the file based on the predetermined allocated space amount. The file management method according to claim 2, wherein the information is generated. 5. A means for storing space management information indicating a storable range of the stored file, and storing a record in the file based on the space management information; and a means for storing a record based on a predetermined allocation space amount. When the file needs to be expanded, it is determined whether the file is being expanded. If the file is being expanded, wait until the expansion of the file is completed, and the expansion of the file is completed.
After that, space management information indicating the storable range of the file is generated, and if the file is not undergoing expansion processing,
If the file is not being expanded, a means for expanding the file based on the predetermined allocated space amount to generate and store space management information indicating a storable range of the file, and at least the file. A file having means for storing a record whose storage position is within the stored space management information until the expanded space management information is generated, based on the stored space management information. Management device. 6. A means for storing first space management information indicating a storable range of the file and storing a record in the file based on the space management information, and a means for storing the file based on a predetermined allocation space amount. When expansion is required, it is determined whether the file is being expanded. If the file is being expanded, wait until the expansion of the file ends, and the expansion of the file ends.
When the second space management information indicating the storable range of the file is generated later and the file is not undergoing expansion processing
Includes the file extension means for generating a second space management information indicating the storage range of the file to extend the file based on the allocation amount of space said predetermined, the second space management information first File extension information notifying means for setting the space management information of No. 1;
Records that are within the range of the space management information of
And a record operating means for storing the file in a file based on the space management information of the file.